Honeywell YRTH7500D1009 Quick Installation Guide - Page 25
Wiring-heat pump
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RTH7400/RTH7500 Series Wiring-heat pump Alternate wiring (for heat pumps only) SETUP WIRING ASSISTANCE 35 C G Y 3 O/B RC 2R 4 6 AUX 6E 5L MCR32161 Leave metal jumper in place, connecting R & Rc terminals. If your old thermostat had both V and VR wires, stop now and contact a qualified contractor for help. If your old thermostat had separate O and B wires, attach the B wire to the C terminal. If another wire is attached to the C terminal, stop now and contact a qualified contractor for help. If your old thermostat had Y1, W1 and W2 wires, stop now and contact a qualified contractor for help. If L terminal is used, C terminal wire must be 5 connected (contact a contractor if there is no C wire). If E and Aux terminals do not each have a wire 6 connected, use a small piece of wire to connect them to each other. Wiring complete, return to Step 7. 23 69-2487ES-01 TROUBLESHOOTING